Ryuuta Yagi

Last Updated :2024/05/07

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
Web Site
http://home.hiroshima-u.ac.jp/~yagi/index.html
E-mail
yagihiroshima-u.ac.jp
Other Contact Details
1-3-１，Kagamiyama，Higashi-Hiroshima, Japan
TEL : (+81)82-424-7041 FAX : (+81)
Self-introduction
My research interest is nano physics and technology. We are currently studying graphene and topological insulators using nano fabrication technique.

Basic Information

Major Professional Backgrounds

  • 2000/06/01, 2002/03/31, Hiroshima University, Cryogenic Center, Associate Professor
  • 1999/06/01, 2000/05/31, Japan Science and Technology Agency, Postdoctoral Fellow
  • 1993/04/01, 1999/05/31, The University of Tokyo, Research Associate
  • 2002/04/01, 2007/03/31, Hiroshima University, Graduate School of Advanced Sciences of Matter, Associate Professor
  • 2007/04/01, 2020/03/31, AdSM, Hiroshima University, Associate Professor

Educational Backgrounds

  • The University of Tokyo, Faculty of Liberal Arts, Department of Pure and Applied Science, Japan, 1984/04, 1988/03
  • The University of Tokyo, Graduate School of Pure and Applied Sciences, Japan, 1988/04, 1990/03
  • The University of Tokyo, Graduate School, Division of Science, Japan, 1990/04, 1993/03

Academic Degrees

  • Doctor of Science, The University of Tokyo
  • Master of Science, The University of Tokyo

Educational Activity

  • [Bachelor Degree Program] School of Science : Physics : Physics
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Quantum Matter Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Quantum Matter Program

In Charge of Primary Major Programs

  • Physics

Research Fields

  • Interdisciplinary science and engineering;Nano / Micro science;Nanostructural physics

Research Keywords

  • Low dimensional material, Nano Science, Mesoscopic system, Graphene

Affiliated Academic Societies

  • APS

Educational Activity

Course in Charge

  1. 2024, Undergraduate Education, Second Semester, Exercises in Statistical Mechanics
  2. 2024, Undergraduate Education, First Semester, Special Study for Graduation A
  3. 2024, Undergraduate Education, Second Semester, Special Study for Graduation B
  4. 2024, Graduate Education (Master's Program) , First Semester, Seminar on Basic Sciences of Matter A
  5. 2024, Graduate Education (Master's Program) , Second Semester, Seminar on Basic Sciences of Matter B
  6. 2024, Graduate Education (Master's Program) , Academic Year, Academic Presentation in Basic Sciences of Matter
  7. 2024, Graduate Education (Master's Program) , 1Term, Exercises in Basic Sciences of Matter A
  8. 2024, Graduate Education (Master's Program) , 2Term, Exercises in Basic Sciences of Matter A
  9. 2024, Graduate Education (Master's Program) , 3Term, Exercises in Basic Sciences of Matter B
  10. 2024, Graduate Education (Master's Program) , 4Term, Exercises in Basic Sciences of Matter B
  11. 2024, Graduate Education (Master's Program) , 3Term, Low Temperature Physics
  12. 2024, Graduate Education (Master's Program) , Academic Year, Advanced Study in Quantum Matter
  13. 2024, Graduate Education (Doctoral Program) , Academic Year, Advanced Study in Quantum Matter

Research Activities

Academic Papers

  1. ★, Effect of perpendicular electric field and its layer-by-layer screening in graphene stacks, Solid State Physics, 678(8), 469-482, 20220815
  2. ★, Superconductor-insulator transition in a two-dimensional array of resistively shunted small Josephson junctions, 85(9), 1974-1977, 20000801
  3. Superconductor-Insulator Transition in Single Small Josephson Junction with Normal Tunneling Junction and with Ohmic Shunt Resistor, Physica B, Ｂ２８０, ４１６－４１７, 20000901
  4. Dissipative Phase Transition in Single Small Josephson Junction with Normal Tunneling Junction, J. Phys. Soc. Jpn., ６８(4), １０７５－１０７７, 19990401
  5. The Effect of Shunt Resistor on Superconductor-Insulator Transition in Single Small Josephson Junctions, Solid State Electronics, ４２(7-8), １４７７－１４８０, 19980701
  6. Two-Dimensional Arrays of Small Josephson Junctions with Regular and Random Defects, J. Phys. Soc. Jpn., 67(4), ７２９－７３１, 19980301
  7. Tuning of Superconductor-Insulator Transition in Single Small Josephson Junctions with Shunt Resistor, J. Phys. Soc. Jpn., 66(11), ３３６０－３３６２, 19971101
  8. ★, Phase Diagram for Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resisto, J. Phys. Soc. Jpn., 66(12), ３７２２－３７２４, 19971201
  9. Chemical Potential Dependence of Resistance of Two-Dimensional Array of Small Tunnel Junctions, J. Phys. Soc. Jpn., 66(1), ２２６－２２７, 19970101
  10. Study on Superconductor-Insulator Transition in Two-Dimensional Arrays of Small Josephson Junctions, J. Phys. Soc. Jpn., 66(8), ２４２９－２４３６, 19970801
  11. Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctions, J. Phys. Soc. Jpn., 65(1), 36-38, 19960101
  12. Meausrement of Self Capacitance via Single Electron Tunneling Transisto, J. Phys. Soc. Jpn., 65(3), 868-869, 19960301
  13. Capacitance Dependence of Critical Tunneling Resistance for Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctio, Physica, B227, 19960501
  14. ★, Effect of Finite System Width in Two-Dimensional Network of Small Tunnel Junctions, Czech. J. Phys., 46(S2), 695-696, 19960801
  15. ★, Phase Diagram for Superconductor-Insulator Transitons in Two-Dimensional Network of Small Tunnel Junctio, Czech. J. Phys., 46(S2), 693-694, 19960801
  16. Edge Effect in Two-Dimensional Network of Small Josephson Junctions, J. Phys. Soc. Jpn., 65(8), 2365-2366, 19960801
  17. Charge-Vortex Duality Breaking in Small Tunnel Junction with Finite Width, J. Phys. Soc. Jpn., 375-377, 19950201
  18. Spectroscopy of a Single Superconducting Fine Particle using a Scanning Tunneling Microscope, J. Phys. Soc. Jpn., 64(4), 1059-1062, 19950401
  19. Breakdown of Charge-Vortex Duality in Small Tunnel Junction Arrays with Finite Width, Jpn. J. Appl. Phys., 34(8B), 4569-4571, 19950801
  20. The Origin of Anomalous Angular Dependent Magnetoresistance Oscillation Effect in a-(BEDT-TTF)2KHg(SCN)4, J. Phys. Soc. Jpn., 63(2), 674-484, 19940201
  21. Effect of Pressure on the Magnetoresistance of CeInCu2, J. Alloy. Compd., 207-208, 271-274, 19940101
  22. On the Peak Inversion of The Angular Dependent Magnetoresistance Oscillation of Cylindrical Fermi Surfaces with Different Corrugation Symmetries, Solid State Commun., 89(3), 275-281, 19940301
  23. Study of the Angular Dependent Magnetoresistance Oscillations in a-(BEDT-TTF)2M(SCN)4 [M:K, NH4], Physica, B201, 474-478, 19940201
  24. Magnetotransport studies of Topology of Fermi Surface of the Quasi Two-Dimensional Organic Conductors (BEDT-TTF)2KHg(SCN)4 , the Isostructural Metal (BEDT-TTF)2(NH4)Hg(SCN)4 and the Quasi One-Dimensional Superconductor (TMTSF)2ClO4, JJAP series, 7(1), 381-389, 19920601
  25. Pressure-Induced Positive Magnetoresistance in the Heavy Fermion Compound CeInCu2, J. Phys. Soc. Jpn., 61(8), 2632-2635, 19920801
  26. Fermiology and unusual high-field magnetotransport in novel organicmetals (BEDT-TTF)2XHg(SCN)4 (X=K,NH4), Synth. Met., 41-3, 2171-2174, 19910801
  27. Angular Dependent Magnetoresistance Oscillation in GaAs/AlxGa1-xAs Superlattice, J. Phys. Soc. Jpn., 60(11), 3784-3791, 19910801
  28. ★, Semiclassical Interpretation of Angular Dependent Oscillatory Magnetoresistance in Quasi-Two-Dimensional Systems, J. Phys. Soc. Jpn., 59(9), 3069-3072, 1990
  29. ★, High-field Magnetotransport and Fermi-Surface Topology in the Novel Quasi-Two-Dimensional Organic Conductor bis(ethylenedithiolo)tetrathiafulvalenium mercuric potassium thiocyanate, (BEDT-TTF)2KHg(SCN)4, Phys. Rev., B41(8), 5428-5431, 19900301
  30. Quantum Oscillations of Magnetoresistance in a New Organic Superconductor (BEDT-TTF)2(NH4 )Hg(SCN)4, Solid State Commun., 75, 901-905, 19901101
  31. ★, Superconductor-Insulator Transition in a Two-Dimensional Array of Resistively Shunted Small Josephson Junctions, Phys. Rev. Lett., 85, 1974, 20000401
  32. ★, Observation of Charge Imbalance in Voltage-Biased Superconductor-Insulator-Normal Tunnel Junctions, Phys. Rev. B, 73, 134507, 20060401
  33. Control of Profile of Josephson Junction by Quasi-Particle Injection, Physica B, 383, 53, 20060401
  34. Observation of Non-Equilibrium Superconductivity using DC-SQUID, Physica B, 383, 55, 20060401
  35. Fabrication of Cr/CrOx/Cr SET Transistors, Physica B, 383, 57, 20060401
  36. Bias dependence of charge imbalance effect in superconducting narrow wires with superconductor/insulator/normal junctions, Physica E, 22, 2004, 20040401
  37. Quasi-Particle Transport in Narrow Superconducting Wires with Superconductor/Insulator/Normal Tunnel Junctions, Superlattices and Microstructures, 34, 263, 20030401
  38. Spatial Decay of Nonequilibrium Quasi^particles in Narrow Superconducting Wires with Injection, AIP Conf. Proc., 850, 1419, 20060401
  39. Fabrication of Cr/CrOx/Cr SET Transistors, AIP Conf. Proc., 850, 751, 20060401
  40. Charge Imbalance Relaxation Due to Pair Breaking Perturbation by magnetic field, J. Phys. Soc. Jpn, 79, 13784, 20100301
  41. Effect of magnetic field on charge imbalance relaxation of Non-Equilibrium superconductivity, Physica C, 470, 877, 20101101
  42. Magnetoresistance oscillation at charge neutrality point in monolayer graphene due to potential fluctuation, J. of Phys. Conf. Ser., 232, 012013, 20100701
  43. Negtive magnetoresistance due to charge fluctuation in mono-layer graphene in magnetic field, Physica E, 42, 673, 20100201
  44. Phase diagram for two-dimensional arrays of small Josephson junctions with shunt resistors, PHYSICA C, 352(1-4), 181-185, 200104
    Link to Paper Search Results by DOI
  45. Bias voltage dependence of charge imbalance effect in lateral superconductor/insulator/normal junctions, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 22(1-3), 757-760, 200404
    Link to Paper Search Results by DOI
  46. Quasi-particle transport in narrow superconducting wires with superconductor/insulator/normal tunnel junctions, SUPERLATTICES AND MICROSTRUCTURES, 34(3-6), 263-269, 2003
    Link to Paper Search Results by DOI
  47. ★, Charge imbalance observed in voltage-biased superconductor-normal tunnel junctions, PHYSICAL REVIEW B, 73(13), 200604
    Link to Paper Search Results by DOI
  48. Effect of quasi-particle injection on retrapping current of Josephson junction, PHYSICA B-CONDENSED MATTER, 383(1), 53-54, 20060815
    Link to Paper Search Results by DOI
  49. Observation of non-equilibrium superconductivity using DC-SQUID junctions, PHYSICA B-CONDENSED MATTER, 383(1), 55-56, 20060815
    Link to Paper Search Results by DOI
  50. All-chromium single electron transistor fabricated with plasma oxidation, PHYSICA B-CONDENSED MATTER, 383(1), 57-58, 20060815
    Link to Paper Search Results by DOI
  51. Study of Quasi-Particle Recombination Rate by Injection Experiment Using Narrow Superconducting Wire and DC-SQUID Junctions, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 78(5), 200905
    Link to Paper Search Results by DOI
  52. Charge Imbalance Relaxation Due to Pair Breaking Perturbation by Magnetic Field, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 79(1), 201001
    Link to Paper Search Results by DOI
  53. Negative magnetoresistance due to charge fluctuation in mono-layer graphene at the minimum conductivity point, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 42(4), 673-676, 201002
    Link to Paper Search Results by DOI
  54. Effect of magnetic field on charge imbalance relaxation of non-equilibrium superconductivity, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470, S877-S878, 201012
    Link to Paper Search Results by DOI
  55. Observing Altshuler-Aronov-Spivak Oscillation in a Hexagonal Antidot Array of Monolayer Graphene, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81(6), 201206
    Link to Paper Search Results by DOI
  56. Graphene Made by Mechanical Exfoliation of Graphite Intercalation Compound, JAPANESE JOURNAL OF APPLIED PHYSICS, 51(8), 201208
    Link to Paper Search Results by DOI
  57. Observing Altshuler-Aronov-Spivak Oscillation in a Hexagonal Antidot Array of Monolayer Graphene, J. Phys. Soc. Jpn., 81, 063707, 2012
  58. ★, Electronic Transport of Graphene Subjected to Periodic Structure Modulation, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 84(12), 20151215
    Link to Paper Search Results by DOI
  59. ★, Ballistic transport in graphene antidot lattices, Phys. Rev. B, 92, 195406, 2015
  60. ★, Electric Transport of Graphene Subjected to Modulated Structures, J. Phys. Soc. Jpn, 84, 212008 1-212008 9, 2015
  61. Magnetoresistance measurements of tetralayer graphene device with single gate electrode,, J. Phys. Conf. Ser., 969, 012150, 20180419
  62. ★, Multilayer graphene shows intrinsic resistance peaks in the carrier density dependence, Sci. Rep., 8, 13992, 2018
  63. ★, Low-energy band structure and even-odd layer number effect in AB-stacked multilayer graphene, Sci. Rep., 8, 13018, 20180826
  64. Magnetoresistance measurements of tetralayer graphene device with single gate electrode, J. Phys. Conf. Ser., 969, 012150, 201804
  65. Multilayer graphene shows intrinsic resistance peaks in the carrier density dependence, SCIENTIFIC REPORTS, 8, 20180918
    Link to Paper Search Results by DOI
  66. Ballistic transport experiment detects Fermi surface anisotropy of graphene, PHYSICAL REVIEW B, 99(3), 20190129
    Link to Paper Search Results by DOI
  67. Low-energy band structure in Bernal stacked six-layer graphene: Landau fan diagram and resistance ridge, PHYSICAL REVIEW B, 99(8), 20190206
    Link to Paper Search Results by DOI
  68. Low-energy band structure and even-odd layer number effect in AB-stacked multilayer graphene, SCIENTIFIC REPORTS, 8, 20180829
    Link to Paper Search Results by DOI
  69. Intrinsic resistance peaks in AB-stacked multilayer graphene with odd number of layers, PHYSICAL REVIEW B, 101(3), 20200121
    Link to Paper Search Results by DOI
  70. Multiband Ballistic Transport and Anisotropic Commensurability Magnetoresistance in Antidot Lattices of AB-stacked Trilayer Graphene, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 89(4), 20200415
    Link to Paper Search Results by DOI
  71. Unconventional satellite resistance peaks in moire superlattice of h-BN/ AB-stacked tetralayer-graphene heterostructures, COMMUNICATIONS PHYSICS, 4(1), 20210526
    Link to Paper Search Results by DOI
  72. On Dielectric Screening in Twisted Double Bilayer Graphene, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90(12), 20211215
    Link to Paper Search Results by DOI

Publications such as books

  1. 1990/08, The Physics and Chemistry of Organic Superconductors , Springer Verlag publishing, 1990, 08, Joint work
  2. 2009/07, Graphene:Functions and Applications, graphene, 2009, 7, Scholarly Book, Joint work, 978-4-7813-0146-4
    Amazon Image Link (Large)

Invited Lecture, Oral Presentation, Poster Presentation

  1. Electronic band structure and transport property in moire superlattice of AB-stacked tetralayer graphene, 2021/03/13, Without Invitation, Japanese, Online
  2. Electronic band structure in graphene with multiple number of layers, Ryuta Yagi, The fullernes, Naotube and Graphene General Symposium, 2020/09/08, Without Invitation, English, Online
  3. New aspects in moire superlattice of h-BN/graphene heterostructures, Ryuta Yagi, Japan-Italy Joint Workshop, Device science of 2D organic and inorganic materials: fundamentals to applications, 2021/07/05, With Invitation, English, Online
  4. Detecting anisotropy in the low Energy Band structure of graphene by ballistic Transport Experiments, Shingo Tajma, Takushi Oka, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi, Shingo Tajma, Takushi Oka, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi, GrapheneWeek 2019, 2019/09/26, Without Invitation, English, Graphene Flagship (EU), Helsinki, Finland
  5. Probing dispersion relations of AB-stacked graphene with intrinsic resistance peaks, Tomoaki Nakasuga, Taiki Hirahara, Shingo Tajima, Kota Horii, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi, Tomoaki Nakasuga, Taiki Hirahara, Shingo Tajima, Kota Horii, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi, Graphene Week 2019, 2019/09/26, English, Graphene Flagship (EU), Helsinki, Finland
  6. Magnetotransport study of mini-Dirac cones of AB-stacked graphene with multiple number of layers in perpendicular electric fields, Kota Horii, Tomoaki Nakasuga, Ryoya Ebisuoka, Shingo Tajima, Kenji Watanabe, Takashi Taniguhi, Ryuta Yagi, Kota Horii, Tomoaki Nakasuga, Ryoya Ebisuoka, Shingo Tajima, Kenji Watanabe, Takashi Taniguhi, Ryuta Yagi, Graphene Week 2019, 2019/09/26, Without Invitation, English, Graphene Flagship (EU), Helsinki, Finland
  7. Evolution of Landau level structure of AB-stacked graphene with increasing number of layers, R. Yagi, T. Hirahara, R. Ebisuoka, T. Oka, T. Nakasuga, S. Tajima, K.Watanabe, T. Taniguchi, Graphene Week 2019, 2019/09/26, Without Invitation, Japanese, Graphene Flagship (EU), Helsink, Finland
  8. Fermi surface anisotropy of graphene measured by ballistic transport experiments on antidot lattice samples, Ryuta Yagi, Takushi Oka, Ryoya Ebisuoka, Taiki Hirahara, Kenji Watanabe, Takashi Taniguchi, APS March meetin, 2019/03/04, Without Invitation, English, American Physical Socienty, Boston, MA, USA
  9. Multilayer graphene shows intrinsic resistance peaks in the carrier density dependence: experiments in tetra- and hexlayer graphene, Ryuta Yagi, Taiki Hirahara, Ryoya Ebisuoka, Takushi Oka, Shingo Tajima , Kenji Watanabe, Takashi Taniguchi, APS March meeting, March 4-8, 2019, Boston, Massachusetts, USA., 2019/03/04, Without Invitation, English, American Physical Socienty, Boston, MA, USA
  10. Low-energy band structure and even-odd layer number effect in AB-stacked multilayer graphene: evolution of Landau fan diagrams from 1 to 7 layers, Ryuta Yagi, Taiki Hirahara, Ryoya Ebisuoka, Tomoaki Nakasuga, Shingo Tajima, Kenji Watanabe, Takashi Taniguchi, Takashi Taniguchi , APS March meeting, March 4-8, 2019, Boston, Massachusetts, USA., 2019/03/04, Without Invitation, English, American Physical Socienty, Boston, MA, USA
  11. Observing evolution of low-energy band structure in Bernal stacked multilayer graphene: from 1 to 7 layers, Ryuta Yagi, Taiki Hirahara, Ryoya Ebisuoka, Ryoya, Takushi Oka, Shingo Tajima, Kenji Watanabe, Takashi Taniguchi, 19th International Conference on the Science and Application of Nanotubes and Low-dimensional Materials ( NT18), 2018/07/15, Without Invitation, English, Beijing China
  12. Observation of Band structure effect in carrier density dependence of dual-gated 4-layer graphene sample at zero magnetic field, Hirahara, Taiki; Ebisuoka, Ryoya; Oka, Takushi; Nakasuga, Tomoaki; Tajima, Shingo; Watanabe, Kenji; Taniguchi, Takashi; Yagi, Ryuta, 19th International Conference on the Science and Application of Nanotubes and Low-dimensional Materials ( NT18), 2018/07/15, Without Invitation, English, Beijing, China
  13. High Field Magnetotransport in the Organic Conductor (BEDT-TTF)2KHg(SCN)4, T. Osada, R. Yagi, S. Kagoshima, N. Miura, M. Oshima, and G. Saito, Physics and Chemistry of Organic Conductors, I.S.S.P. International Symposium, Without Invitation, English, Tokyo, Japan
  14. Fermiology and unusual high-field magnetotransport in novel organicmetals (BEDT-TTF)2XHg(SCN)4 (X=K,NH4), T. Osada, R. Yagi, A. Kawasumi, S. Kagoshima, N. Miura, M. Oshima, H. Mori, T. Nakamura, and G. Saito, International Conference on Science and Technology of Synthetic Metals (ICSM ‘90), 1990/09/02, Without Invitation, English, Tubingen, Germany
  15. Angular Dependent Oscillatory Magnetoresistance in Quasi-Two-Dimensional Systems, R.Yagi, Y.Iye, T.Osada, and S.Kagoshima, International Conference on Science and Technology of Synthetic Metals (ICSM 90), 1990/09/02, Without Invitation, English, Tubingen, Germany
  16. Angular Dependent Magnetoresistance Oscillation in GaAs/AlxGa1-xAs Superlattice, R. Yagi, Y. Iye, Y. Hashimoto, T. Odagiri, H. Noguchi, H. Sakaki and T. Ikoma, Electronic Properties of Two-Dimensional Systems (The 9th international Conference), 1991/07/08, Without Invitation, English, Nara, Japan
  17. Magnetoresistance in Modulated Structures, Y. Iye, R. Yagi, Y. Hashimoto, and T. Ikoma, Second International Symposium on New phenomena in Mesoscopic Structures, 1992/12/05, Without Invitation, English, Hawaii, USA
  18. reakdown of Charge-Vortex Duality in Small Tunnel Junction Arrays with Finite Width, R. Yagi and S. Kobayashi, International Workshop on Mesoscopic Physics and Electronics (MPE 95), Without Invitation, English, Tokyo, Japan
  19. Capacitance Dependence of Critical Tunnelling Resistance for Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctions, R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi, Third International Symposium on New phenomena in Mesoscopic Structures, 1995/12/04, Without Invitation, English, Hawaii, USA
  20. Effect of Finite System Width in Two-Dimensional Network of Small Tunnel Junctions, R. Yagi, T. Yamaguchi, and S. Kobayashi, International Conference on Low Temperature Physics (LT21), 1996/08/07, Without Invitation, English, Prague, Czech
  21. Superconductor-Insulator Transitons in Two-Dimensional Network of Small Tunnel Junctions, R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi, International Conference on Low Temperature Physics (LT21), 1996/08/07, Without Invitation, English, Prague, Czech
  22. Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor, R. Yagi, S. Kobayashi, CMD Condensed Matter Division, Europian Physical Society, 1997/08/18, Without Invitation, English, Leuven, Belgium
  23. Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor, R. Yagi, S. Kobayashi and Y. Ootuka, International Workshop on Nano-Physics and Electronics, 1997/09/18, Without Invitation, English, Tokyo, Japan
  24. Dependence on Shunt Resistance and Distance on Single Small Josephson Junctions, R. Yagi, S. Kobayashi and Y. Ootuka, Fourth International Symposium on New phenomena in Mesoscopic Structures, 1998/12/06, With Invitation, English, Hawaii, USA
  25. Resistance Fluctuation in Narrow Ferromagnetic Wires, S. Sakita and R. Yagi, International Conference on Low Temperature Physics, 2002/08/12, Without Invitation, English, Hiroshima, Japan
  26. Quasi-Particle Transport in Narrow superconducting wires with superconductor/insulator/normal tunnel junctions, R. Yagi, Sixth International Conference on New Phenomena in Mesoscopic Structures and Fourth International Conference on Surfaces and Interfaces of Mesoscopic Devices (NPMS-6 ), 2003/12/01, Without Invitation, English, Hawaii, USA
  27. Non-equilibrium Quasi-Particle Transport in Narrow Superconducting Wires, Y. Ikebuchi and R. Yagi, The 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS), 2003/07/14, Without Invitation, English, Nara, Japan
  28. Non-equilibrium Quasi-Particle Transport in Narrow Superconducting Wires, R. Yagi, Mesoscopic Superconductivity and Spintronics (MS+S 2004), 2004/03/01, Without Invitation, English, Atsugi, Japan
  29. Quasi-particle recombination in Narrow Superconducting Wires, R. Yagi, 24th International Conference on Low Temperature Physics, 2005/08/10, Without Invitation, English, Florida, USA
  30. Observation of Non-Equilibrium Superconductivity Using DC-SQUID, H. Sera, Y. Ikebuchi and R. Yagi, The 3rd Hiroshima Workshop NFM2F, 2005/11/16, Without Invitation, English, Higashi-Hiroshima, Japan
  31. Effect of Quasi-particle injection on retrapping current of Josephson junction, K. Utsunomiya and R. Yagi, The 3rd Hiroshima Workshop NFM2F, 2005/11/16, Without Invitation, English, Higashi-Hiroshima, Japan
  32. Transport property of Cr/CrOx/Cr Single Electron Transistor fabricated using Plasma Oxidation ,, T. Kubota and R. Yagi, The 3rd Hiroshima Workshop NFM2F, 2005/11/16, Without Invitation, English, Higashi-Hiroshima, Japan
  33. Energy Distribution of Quasi-Particle Charge Density in Mesoscopic Superconducting Wires, K. Tsuboi, K. Utsunomiya, T. Kubota, Y. Terao, Y. Ikebuchi, R. Yagi, Mesoscopic Superconductivity and Spintronics (MS+S2006), 2007/02/27, Without Invitation, English, Atsugi, Japan
  34. Quasi-Particle Recombination in mesoscopic superconducting wires, K. Utsunomiya, K. Tsuboi, T. Kubota, Y. Terao, Y. Ikebuchi, R. Yagi, Mesoscopic Superconductivity and Spintronics (MS+S2006), 2006/02/27, Without Invitation, English, Atsugi, Japan
  35. Physics of small tunnel junctions, R. Yagi, 1st HU-SKKU Workshop on Advanced Materials Research, 2006/11/16, With Invitation, English, Higashi Hiroshima, Japan
  36. Relaxation of Charge Imbalance in Non-equilibrium Superconductivity Due to Pair Breaking Perturbation by Magnetic Field, K. Tsuboi and R. Yagi,, 9th International Conference on Material and Mechanisms of Superconductivity (M2S-IX), 2009/09/07, Without Invitation, English, Tokyo, Japan
  37. Negative magnetoresistance due to charge fluctuation in mono-layer graphene at the minimum conductivity point, R. Yagi, S. Fukada, H. Kobara, N. Ogita and M. Udagawa, The 18th international conference on electronic property of two dimensional systems （EP2DS）, 2009/07/19, Without Invitation, English, Kobe, Japan
  38. Magnetic fingerprint of mono-layer graphene, Ryuta Yagi, Seiya Fukada, Yumi Shintani, Recent Advances in Graphene and Related Materials, 2010/08/01, Without Invitation, English, Singapore
  39. Fluctuation of magnetoresistance at the minimum conductivity point of monolayer graphene due to potential fluctuation, R. Yagi, S. Fukada, Y. Shintani, Americal Physical Society March meeting, 2010/03/15, Without Invitation, English, American Physical Society, Portland, USA
  40. On low field magneto-resistance oscillations in moiré superlattices of bilayer graphene/h-BN, Ebisuoka, T. Hirahara, K. Watanabe, T. Taniguchi, and R. Yagi,, 28 th International Conference of Low Temperature Physics, 2017/08/09, Without Invitation, English, Goeteborg, Sweden
  41. Ballistic and phase coherent transport in high-mobility graphene antidot lattices made on h-BN, Ryuta Yagi, Ryoji Sakakibara, Ryoya Ebisuoka, Jumpei Onishi, Kenji Watanabe, Takashi Taniguchi2, and Yasuhiro Iye, Graphene Malaysia, 2016/11/08, Without Invitation, English, Kuala Lumpur, Malaysia
  42. CVD Growth of Bi2Se3 Crystals, R. Yagi and T. Takegawa, APS March Meeting, 2017/03/13, Without Invitation, English, American Physical Society, New Orleans, USA
  43. Fabricating graphene from graphite intercalation compounds, R. Yagi, M. Shimomura, F. Tahara, S. Fukada, Americal Physical Society March meeting, Baltimore,, 2013/03/18, Without Invitation, English, Baltimore, USA
  44. Magnetoresistance of thin film devices fabricated from bulk crystal of Bi2Se3 and Bi2Te3, R. Yagi, R. Sakakibara, F. Tahara, J. Onishi, D. Takegawa, Americal Physical Society March meeting, 2014/03/04, Without Invitation, English, Americal Physical Scociety, Denver, USA
  45. Ballistic transport in graphene antidot lattices, R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi, K. Watanabe, T. Taniguchi and Y. Iye, Americal Physical Society March meeting, Without Invitation, English, American Physical Socieity, Baltimore, USA
  46. Graphene made by exfoliation of graphite intercalation compound, R. Yagi, M. Shimomura, and S. Fukada, The Sixteenth International Conference on the Science and Application of Nanotubes, 2015/06/28, Without Invitation, English, Nagoya, Japan
  47. Magnetotransport study of electronic band structure in tetralayer graphene using high-mobility graphene fabricated on h-BN, T. Hirahara, S. Uchino, R. Ebisuoka, J. Onishi, K. Watanabe T. Taniguchi and R. Yagi, The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, 2016/07/25, With Invitation, English, Sappro, Japan
  48. Commensurability magnetoresistance due to ballistic transport in highmobility graphene antidot lattices made on h-BN, R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi, K. Watanabe, T. Taniguchi and Y. Iye, 33rd International Conference on the Physics of Semiconductors, 2016/07/31, Without Invitation, English, Beijing, China
  49. Magneto-transport of high-mobility graphene antidot lattices made on h-BN – ballistic and phase coherent transport, R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi, K. Watanabe, T. Taniguchi and Y. Iye., The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, 2016/07/25, Without Invitation, English
  50. Brillouin zone folding and anisotropic ban structure in more superlattices in bilayer graphene/h-BN heterostructur, R. Ebisuoka, S. Uchino, T. Hirahara, J. Onishi, K. Watanabe, T. Taniguchi and R. Yagi, The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, 2016/07/25, Without Invitation, Japanese, Sapporo, Japan
  51. Magnetotransport of graphene FET, R. Yagi, The 4th International Symposium on Atomic Technology, 2009/11/17, With Invitation, English
  52. Superconductor-Insulator Transition in Single Small Josephson Junction with Normal Tunneling Junction and Ohmic Shunt Resistor, R. Yagi, S. Kobayashi and Y. Ootuka, 22 th International Conference on Low Temperature Physics (LT22), 1999/08/04, With Invitation, English
  53. Landau level structure of Bernal-stacked tetra-layer graphene, T. Hirahara, R. Ebisuoka, K. Watanabe, T. Taniguchi, and R. Yagi, 28 th International Conference of Low Temperature Physics, 2017/08/09, Without Invitation, English, Goetegorg, Sweden
  54. On low field magneto-resistance oscillations in moiré superlattices of bilayer graphene/h-BN, Ebisuoka, T. Hirahara, K. Watanabe, T. Taniguchi, and R. Yagi, 28 th International Conference of Low Temperature Physics,, 2017/08/09, Without Invitation, Japanese, Goetegorg, Sweden
  55. Quantum Correction to Conductance in Graphene Antidot Lattices, R. Yagi, R. Yagi, R, Sakakibara, and R. Ebisuoka, 21st International Conference on Electronic Properties of Two-Dimensional Systems, Sendai, Japan, 2015/07/26, Without Invitation, English, Sendai, Japan
  56. Graphene made by exfoliation of graphite intercalation compound, R. Yagi, R. Yagi, M. Shimomura, and S. Fukada, The Sixteenth International Conference on the Science and Application of Nanotube, 2015/06/28, Without Invitation, English, Nagoya, Japan
  57. Altshuler-Aonov-pivak oscillation in graphene antidot lattice, R. Yagi, S. Sakakibara, J. Onishi, R. Ebisuoka, APS March Meeting 2015, 2015/03/04, Without Invitation, English, Americal Physical Society, San Antonio, Texas, USA
  58. Superconductor-Insulator Transitions in Single Small Josephson Junction with Normal Tunneling Junction and Ohmic Shunt Resistor, R. Yagi, 22th International Conference on Low Temperature Physics, 1999/08, With Invitation, Japanese

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI, 2013, 2017
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  2. KAKENHI, Study of quasi-particle conduction in small non-equilibrium superconductors, 2004, 2005
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  3. KAKENHI, 2002, 2003
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  4. 小笠原財団研究助成, 金属微小トンネル接合の物理, 2001, 2003
  5. CREST, 微細構造におけるスピン量子物性の開拓, 2000, 2001
  6. KAKENHI, 1999, 1999
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  7. KAKENHI, 1998, 1998
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  8. KAKENHI, 1997, 1997
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  9. KAKENHI, SCANNING SET TRANSISTOR MICROSCOPE, 1997, 1998
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  10. 倉田奨励金, 並列微小トンネル接合による電荷の巨視的量子トンネルの研究, 1997, 1999
  11. KAKENHI, 1996, 1996
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  12. KAKENHI, 1996, 1997
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  13. CREST, 金属微小トンネル接合システム, 1996, 1999
  14. KAKENHI, 1995, 1995
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  15. KAKENHI, 1994, 1994
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Social Activities

History as Committee Members

  1. Journal of Physical Society of Japan, Associate Editor, 2022/04, 2024/03, Physical Society of Japan

Organizing Academic Conferences, etc.

  1. The 3rd Hiroshima Workshop NFM2F, Organizing committee, 2005/11, 2005/11

Other Social Contributions

  1. オープンキャンパス 講義